I have seven bikes, but I only commute on one . . . my DaHon Curve SL. Because: Part of my commute is on the Metro Train and the DaHon folds up nicely (16" wheels so it's a pretty small fold!).
However, and this big, they have just started putting "bicycle" areas on some of the Metro train cars. They aren't marked from the outside (yet), so they're difficult to find in the few seconds the trains stop for unloading/loading passengers . . . and there are no hooks for bicycles (yet), just this area where three rows of seats have been removed on one side of the train-car. Still, it's progress!
So hopefully, someday, maybe someday soon, they will have the cars marked (or maybe always use the last car, or always use the middle car, something consistant) and I'll be able to ride some of my non-folding bikes to work! That will be great!
Rick / OCRR